Is this why you're not getting enough sleep?

A country’s average bedtime – not the time it wakes up – has the biggest impact on sleep duration. Image: REUTERS/Enrique Castro-Mendivil

Emma Luxton

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Sleep duration, wake time and bed time in surveyed countries.
Image: A global quantification of “normal” sleep schedules using smartphone data by Olivia J. Walch, Amy Cochran and Daniel B. Forger.
Time of sunrise and sunset and wake time and bedtime of participants.
Image: A global quantification of “normal” sleep schedules using smartphone data by Olivia J. Walch, Amy Cochran and Daniel B. Forger.
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